That's a really surprisingly strong reaction - like, 10-20mg of diaz equiv, I would expect that.... though diaz is also I think a little more visible, more dis-coordination vs most benzos. I have definitely enjoyed 10mg diazepam with potentiators (with basically no benzo tolerance), but my gf at the time didn't know I was on anything until she asked me why I wasn't getting a beer at the restaurant... I have never once been called out for being on benzos - only things I've been called out for are being quite high on G, and once, looong ago, a comment on what a good mood I was in when I was coming up on some psychedelic and mom wasn't going to bed as early as I expected.
I am very rarely high enough that people comment on it, though - I mean, when I'm not like at a drug-fueled hang-out session or party, and going hard. I think different people have different levels of ability to hide being high. I appear to be really fucking good at it, though that also makes it more tempting to use drugs too often, or too casually, because nobody notices. Benzos are definitely very good at the delusions of sobriety, though - though I've also gotten the impression that the delusion of sobriety, especially if it is a benzo that doesn't impact coordination, so you're not sloppy, not slurring - no blatant tell - sometimes the delusion of sobriety can include the observers. I have known people who on occasion thought they weren't that messed up, people around them thought they were good, but the next day they have no memory of it.